| Owner | Manager | From | Until |
| Western Transit Company - Buffalo, New York, USA | Subsidiary of the New York Central Railway Company | 1884/10 | 1912 |
| Port Huron & Duluth Steamship Company - Port Huron, Michigan, USA | | 1912 | 1917 |
| Northwestern Steamship Company - Port Huron, Michigan, USA | | 1917 | 1918 |
| Minnesota Loan & Trust Company - Duluth, Minnesota, USA | | 1918 | 1919/04/29 |
| Lakes & St. Lawrence Transit Company - Cleveland, Ohio, USA | Peterson & Collinge - USA | 1919/04/29 | 1924 |
| Ruben W. Eberly - Buffalo, New York, USA | | 1924 | 1925 |
| Buffalo Gravel Corporation - Buffalo, New York, USA | | 1925 | 1947 |
| Schwartz Sand & Gravel Corporation - Detroit, Michigan, USA | | 1947 | 1953 |
| Construction Materials Corporation - United States | | 1953 | 1962 |
| Seaway Cartage Company - United States | | 1962/03 | 1965 |
| Toth Transportation Company - Toledo, Ohio, USA | | 1965 | 1968/06 |
| C.I.T. Corporation - United States | | 1968/06 | 1968/12 |
| James W. O'Rourke - United States | | 1968/12 | 1969/03 |
| Walter Kolbe - Port Clinton, Ohio, USA | | 1969/03 | 1974 |